Pirn with spindle snugging mounting



Feb. 24,' 1970 c. c. LALLEMAND 3,497,149

PIRN WITH SPINDLE SNUGGING MOUNTING 3 Sheets-Sheet l Filed March l5, 196'? INVENTOR.

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Feb 24, 1970 c. c. LALLEMAND 3,497,149

PIRN WITH'SPINDLE SNUGGING MOUNTING Y I N VEN TOR.

BY zo@ Feb. 24, 1910 C. UMLEMAND 3,497,149

PIRN WITH SPINDLE SNUGGING MOUNTING Filed March 15, 1967 s sheets-sheet 9 l ll/ll INVNTOR.

United States Patent O 3,497,149 PIRN WITH SPINDLE SNUGGING MOUNTING Charles C. LAllemand, Murray Hill, NJ., assignor to The Dyson-Kissner Corporation, New York, N.Y., a corporation of Delaware Filed Mar. 15, 1967, Ser. No. 623,386 Int. Cl. B65h 75/30 U.S. Cl. 242-46.21 9 Claims ABSTRACT OF THE DISCLOSURE A pirn having drive engagement with the spindle is iitted with one or more sets of resilient tongues which engage an untapered spindle section, so that vibration is avoided while securing the pirn against riding up. Increased spindle operating speeds and longer spindle bolster bearing life can thus be obtained.

This invention relates to textile bobbins, and more particularly to draw twister tubes or pirns.

It is a general object of the invention to provide a pirn with drive connection to the spindle, such as, for example, the polygonal or key drive connections of U.S. Patents 2,625,335 and 3,132,817, and at the same time eliminate any vibatiou and wear which may occur, particularly at the spindle bolster bearing, due to the pirn being free to run ahead of the spindle when the spindle decelerates or due to tilting movement of the pirn axis or lateral movement of the pirn under vibration conditions.

It has previously been proposed to seat the pirn on a tapered spindle base, but such arrangements have the disadvantage that they possess an inherent instability under centrifugal forces and under vibratory conditions. The angle of taper may be such as to prevent vertical movement due to the wedging action of horizontal forces on the pirn. However, the normal vibration accompanying spindle rotation may be sufficient to nullify the normal static friction betwen the parts, so that there is a continual shifting between the centering action of the polygonal or other rigid drive and that of the taper. Normally occurring ovality of the drive end fitting may also result in only point contact with the taper at times and line contact at others. Pirns have been observed to jump under action of these forces, and to a point where the yarn previously wound thereon becomes waste. Seating of the pirn on a taper has a further objectionable feature in that the pirn may be located higher or lower on the taper, depending on tolerances, and may shift vertically during winding, due to the increasing mass of the pirn and yarn carried thereby. This can cause a variation in the yarn location or interference with the winding action resulting in rejection of the yarn.

It is an object of the invention to provide a pirn which is free of the deficiencies just mentioned and which restrains pirn movement relative to the spindle.

Resiliently gripping pirns have been proposed previously and have found some acceptance. In particular, centrifugal adapters have been provided, but have not proved satisfactory, although they avoided the defect of other resilieutly gripping means in interfering with the placement and removal of the pirn. However, such resilient connections between pirn and spindle are subject to the defect that they form, together with the (variable) mass of the pirn and yarn wound thereon, a poorly damped oscillatory system, which may at any time develop resonant frequencies corresponding to the spindle rotation speed or its harmonics, causing serious wear and interference with the yarn.

It is an object of the invention to provide resilient gripping action to supplement the rigid drive connection, but in such a way that resonance eiiects are eliminated and the sudden shocks of intermittent drive action are also avoided.

Still another object of the invention is to obtain the foregoing advantages while not interfering noticeably or objectionably with the placement or removal of the pirn.

With the foregoing objects in mind, as well as others which may appear in the course of the following full description, a preferred embodiment of the invention will now first be described with reference to the accompanying drawing and the features forming the invention will then be pointed out in the appended claims.

In the drawing:

FIG. 1 is a somewhat schematic side elevational view of a pirn and spindle embodying the invention in a preferred form;

FIG. 2 is an enlarged fragmentary exploded view, partly in axial section on the line II-II of FIG. 3 and partly in side elevation;

FIG. 3 is a bottom elevational view of the pirn, looking in the direction of the arrows III-III of FIG. 1;

FIG. 4 is a side elevational View as to the spindle, showing the pirn drive end and spindle bearing in central axial section;

FIG. 5 is a plan View of the spindle base, with the prn removed;

FIG. 6 is a much enlarged and somewhat schematic section on the line VI-VI of FIG. 3, showing the action of one of the resilient gripping iingers;

FIG. 7 is a View in elevation as to the spindle and in section on the line VII- VII of FIG. 8 as to the pirn, showing a modification; and

FIG. 8 is a view, partly in section on the line VIII- VIII 0f FIG. 7, and partly in plan elevation.

The pirn 1 is shown as seated on the whorl 2 of a spindle. The pirn barrel 3 has a top fitting 4, which may be, for example, of the type shown in prior Patent 2,953,317 and is equipped with a spindle bearing 5 which receives the spindle 6 and with a reinforced ring 7. The last-mentioned elements and their relation to the spindle may be as disclosed in prior Patents 2,625,335 and 3,132,817. 'The drive end fitting 8 may have the rigid polygonal drive engagement of the two patents just mentioned, with the spindle base.

The spindle base comprises a taper 9 for guiding the pirn into place, a cylindrical section 10, which fits in the centering aperture of the drive end of the pirn and is engaged by the resilient gripping means described below, and a polygonal lug 11 for providing a drive connection between spindle and pirn.

The barrel 3 comprises a metal tube 12 which seats on a shoulder 13 of the drive end fitting (FIGS. 2 and 4) and a plastic cover 14 which overlaps surface 15 of the fitting. The structure of the drive end fitting 8 may be generally like that shown in Patent 2,953,317 and the cover 14 and its relation to other elements may be as disclosed in Patents 3,095,161 and 3,107,067.

The drive end tting has a skirt 17 which fits in a reinforcement 16 in the form of an annular ferrule and is driven into the barrel member 12 with a force fit which holds the end fitting in place (Patent 2,953,317). The drive end fitting has a socket with flats and rounds 19, 20 cooperating with the fiats and rounds 21, 22 of the drive lug 11.

As thus far described, the pirn is generally like those disclosed in the above-mentioned patents, to which reference may be made for the details of construction, which in themselves form no part of the present invention, except as pointed out below.

Above the socket 19, 20 and radially inward of skirt 17 is a further cylindrical fiange element 23 which has a cylindrical inner surface fitting around the spindle base section 10. The flange element 23 of the pirn and the base section of the spindle together comprise centering means for the pirn and the spindle. The upper edge of flange element 23 is slotted to form spring tongues 25, shown as nine in number, separated by gaps or slos 26. The tongues 25 have comparatively thick heads 27, supported by the gradually thinning sections 28 on the shafts 29. The inner surfaces of shafts 29 are concentric with and continue the inner surface of flange element 23 at =the same radial distance (r-Z) from the drive end axis, while the inner surfaces of heads 27 are again concentric with the inner surface of flange element 23 but are at a lesser radial distance (r-l) from the drive end axis.

The invention is applicable to pirns or bobbins of different sizes and proportions and in which the parts are made of a variety of materials. For convenience of description, a bobbin of one and three quarters inch diameter and proportioned as in FIG. l will be discussed by way of example. The tube 12 will be assumed to be steel, although aluminum and other materials may be used, and the end fitting 8 will be assumed to be nylon, although other materials may be used, such, for example, as A.B.S. resin or metal.

The clearance between fiange element 23 and spindle base 10 may be about 0.002 (radial), while the overhang or projection of the heads 27 of the tongues 25 may be about 0.020 (radial). Thus, even after making due allowance for manufacturing tolerances, a deflection of thel spring tongues 25 of about ten times the permitted movement of the drive end from centered position may be had. Under these conditions, the resistance to relative movement due to the friction between the spring tongues and the spindle base 10 is large, being comparable to the spring force opposing the movement, and a large damping effect is provided, eliminating any tendency toward vibration.

The rate of the spring tongues and the force exerted in centered position can be regulated very closely by varying one or more of the following factors:

(a) The vertical height of slots 26 and consequently the overall length of spring tongues 25;

(b) The relative lengths of sections 27, 28 and 29;

(c) The thicknesses (radially) of these sections;

(d) The proportion between angle subtended by slots 26 and angle subtended by tongues 25;

(e) The overhang of the spring tongues, or difference between radii r-l and r-2; and

(f) The number of tongues.

With reference to the last-mentioned factor, it will be noted that the moment of inertia of the tongue cross section depends very much on the degree of circumferential arching, so that by decreasing the number of tongues and correspondingly increasing the angle subtended by each tongue, the `total spring force can be very much i11- creased.

While the spring tongues have been shown as extending upwardly from the upper edge of a centering aperture which is itself located above the drive connection between pirn and spindle, the tongues may also extend downwardly `and be positioned either above or below the centering aperture or drive connection, as the arrangement of elements may make convenient. The tongue gripping action may be supplemented by additional spring elements, as, for example, by a split ring or garter spring, surrounding the tongues and pressing them against the spindle base section.

The spring gripping action may also be applied at the upper spindle bearing point, as shown in FIGS. l, 3 and 4. The spindle bearing member 5 has a flange element 23 fitting around the spindle blade 6 and resilient spring tongues 25 which grip the spindle blade. These tongues are defined by slots 26 and have thickened tips 27', tapering sections 28' and shanks 29. Since the structure and function of these parts is the same as already described with reference to the similarly numbered parts in the drive end fitting, no further description is required. The skirt 17' of member 5 may simply fit in the barrel member 12, as shown, or it may also be provided with a reinforcement like the member A16.

FIGS. 7 and 8 show a modification of the pirn structure. In this case, the spindle base has a dog or key drive, rather than a polygonal drive, and the pirn drive end is modified accordingly. Spindle base section 10 has a pair of diametrally opposed dogs or keys 30, which engage in apertures or recesses 31 in the drive end fitting. In the specific structure shown by way of illustration, there are six recesses 31, to permit placing the pirn on the spindle in various angular positions, and recesses are provided as shown at 32 for manufacturing and structural reasons. The present invention, however, is not concerned with these details.

The pirn drive end has a centering aperture, formed by the tubular flange 33, and a skirt or outer tubular flange 37, which fits into reinforcement -ring 36 and is force fitted into the barrel. The similarity of the structure as thus far described to that of FIGS. l to 6 will be apparent. The remainder of the structure may also be the same as in earlier figures, spring tongues 25 being formed on the drive end itself as shown in FIG. 2. There is shown in FIGS. 7 and 8, however, a modified form of resilient gripping means, the inner flange 33 terminating above centering aperture and the spring tongues 35 being formed on the element 36, which fits the skirt or outer flange 37 for holding the drive end in the barrel, as the element 16 fits flange 17, previously described. Element 36 is extended radially inward and formed into spring tongues 35, separated by cutouts 38 and which engage the spindle base 10 in the same way as the tongues 25. Element 36 being metal, further control of spring rate and pressure can be had, as also variation of fricton coefficient, where desired.

As will be apparent, the spring tongue construction of FIGS. 7 and 8 can `be substituted for the corresponding structure of the polygonal drive end or upper bearing elements of FIGS. 1 to 6.

The pirn of the invention is placed on the spindle and removed in the same manner as heretofore, the pirn being pushed down on the spindle and twisted so as to engage the rigid drive elements, and the pirn being removed by lifting it off the spindle manually. In the first case, the spring action and friction against the spindle base serve merely to absorb the shock of placement of the pirn. In removal, the effort involved in lifting the weight of pirn and yarn is not altered appreciably by the frictional resistance of the spring tongues engaging spindle Ibase section 10.

What is claimed is:

1. In a draw twist machine, a spindle and pirn carried thereby, cooperating drive means on the spindle and pirn for driving the pirn from the spindle, and centering means on the pirn and spindle for limiting lateral relative movement thereof, said centering means `comprising a cylindrical base section of the spindle and a cylindrical element of the pirn disposed about the spindle base section, the inside diameter of said cylindrical element of the pirn being greater than the outside diameter of said cylindrical base section of the spindle so as to provide clearance therebetween, the cylindrical element of the pirn being provided with a plurality of circumferentially spaced spring tongues having enlarged inwardly project ing heads that `bear resiliently against the spindle base section thereby opposing lateral relative movement away from centered position.

2. The combination according to claim 1, in which .the spring tongues are vertically spaced from the drive means.

3. The combination according to claim 1, in which the spring tongues are defiected by their engagement with the spindle base section by a distance which is large by comparison with said clearance.

4. The combination according to claim 3, in which the said dellection distance is about ve times or more as great as said clearance.

5. A pirn having a bearing for tting a spindle and a drive end for seating on a spindle whorl and providing a drive connection thereto, characterized by a socket for engaging with a spindle base member to form a rotary drive connection, in combination with an internal axially concentric cylindrical ange element in the pirn for centering the pirn about a cylindrical base section of the spindle, the inside diameter of said cylindrical element of the pirn being greater than the outside diameter of said cylindrical base section of the spindle so as to provide clearance therebetween, and a plurality of spring tongues having enlarged heads extending radially inward of said ange element to engage and grip the cylindrical base section and hold the pirn to the spindle against vibration.

6. A pirn according to claim 5, in which the said socket is polygonal.

7. A pim according to claim 5, in which the said socket has diametrally opposed recesses for engaging the keys of a whorl.

8. A pim according to claim 5, in which the spring tongues protrude radially inward beyond said iiange ele- 6 ment by a large distance in comparison to the clearance of the said flange element around the cylindrical base sections of the spindles, whereby the spring rate of the said tongues is small by comparison with the pressure exerted thereby when placed around a spindle.

9. The combination with a pirn according to claim S, of a spindle having a base section with clearance radially from said ange element which is only about one fth or less of the radial deflection of the spring tongues when engaged against said section.

References Cited UNITED STATES PATENTS 51,340 12/1865 Murdock 242-4621 1,972,784 9/1934 Magrath 242-4621 2,262,787 11/1941 Anderson 242-4621 2,377,920 6/ 1945 Atwood 242-1 18.31 2,625,335 l/1953 Atwood 242-4621 2,879,010 3/1959 Crawford 242-118.32 2,953,317 9/1960 Atwood et al. 242-4621 X 2,987,267 6/1961 Hayes et al. 242-118.31 X 3,132,817 5/1964 Atwood et al. 242-4621 5 STANLEY N. GILREATH, Primary Examiner U.S. Cl. X.R. 

